The main Sumerian deities are:An: god of heaven, the firmamentEnlil: god of the air (from Lil = Air); patron deity of NippurEnki: god of freshwater, male fertility, and knowledge; patron deity of EriduEreshkigal: goddess of the underworld, Kigal or IrkallaInanna: goddess of warfare, female fertility, and sexual love; matron deity of UrukNammu was the primeval sea (Engur), who gave birth to An (heaven) and Ki (earth) and the first deities; eventually became known as the goddess TiamatNinhursag: goddess of the earth Nanna: god of the moon; one of the patron deities of Ur Ningal: wife of Nanna Ninlil: an air goddess and wife of Enlil; one of the matron deities of Nippur; she was believed to reside in the same temple as Enlil Ninurta: god of war, agriculture, one of the Sumerian wind gods; patron deity of Girsu, and one of the patron deities of LagashUtu: god of the sun at the E-babbar temple of Sippar [link to en.wikipedia.org]

Quoting: observation

Sumerians are 12 gods

Quoting: aether

In Greek mythology, the Twelve Olympians, also known as the Dodekatheon were the principal deities of the Greek pantheon, residing atop a mythical Mount Olympus.